and many cheered the law enforcement officials that successfully tracked him down. the suspect's brother, tamerlan tsarnaev was killed earlier after a gunfight with police. he left behind dreams of becoming a world-class boxer, and we found a youtube page in his name linked to islamic websites. and then tamerlan tsarnaev was quoted as saying i don't have a single american friend. i don't understand them. he and his brother are from the russian caucuses, an area that includes the war-torn regions of chechnya and dagestan. the younger brother became a u.s. citizen on september 11th of last year, and tamerlan followed and got a green card. dzhokhar won a scholarship before enrolling at the university of massachusetts. and people we spoke to said they never saw any signs of trouble. >> regular teenager. did not suspect anything. he was on the wrestling team. went to parties with other students. yeah. he went to the prom. >> he was a wonderful kid. we were proud of him. he was an outstanding athlete. he was -- there is nothing -- you know, he was never a troublemaker in